Bonaventura Francesco Cavalieri was an Italian mathematician and a Jesuate. He is known for his work on the problems of optics and motion, work on indivisibles, the precursors of infinitesimal calculus, and the introduction of logarithms to Italy. Cavalieri's principle in geometry partially anticipated integral calculus. 1598 – November 30, 1647; died at about 49. Alive at the same time as William Shakespeare, René Descartes, Rembrandt, Osman II, and Miguel de Cervantes. Wiki link